Django-flags

- Fix a TypeError when a configured condition has no function registered 15

- Allow configurable flag sources 12
- Add middleware to attach flag conditions to the request 11
- Allow passing kwargs to flag_enabled and flag_disabled template tags 14
- Fix docs mobile style and match screenshot to docs 13
- Fix some bad links in docs and style errors 10
- Remove unused logger 8
- Allow user_condition to work with custom user models 7

This release contains breaking changes. Please see the [release notes](https://cfpb.github.io/django-flags/releasenotes/#40) for more.

- Make requests optional in template tags 3
- Bind condition choices when admin form is created 4
- Remove deprecated github markdown extension 6

- Add Django 2.1 support and improve test coverage generally [2](https://github.com/cfpb/django-flags/pull/2)

This is the initial release of Django-Flags, the Django-only components of [Wagtail-Flags](https://github.com/cfpb/wagtail-flags).